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Redeemable Convertible Preferred Stock - Preferred Stock (Details) $ / shares in Units, $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) vote director $ / shares shares | Mar. 31, 2017 $ / shares shares | Feb. 28, 2017 $ / shares shares | Dec. 31, 2016 USD ($) shares
Temporary Equity [Line Items] |  |  |  |  |
Shares Authorized (in shares) | 0 | 12,104,749 |  |  |
Redeemable convertible preferred stock issued (in shares) | 0 | 11,871,578 |  |  |
Redeemable convertible preferred stock outstanding (in shares) | 0 | 11,871,578 |  |  | 11,330,704
Carrying Value | $ | $ 0 | $ 118,548 |  |  | $ 113,121
Liquidation Value | $ | $ 0 | $ 119,194 |  |  |
Series 2 common stock, number of directors entitled to elect | director |  | 2 |  |  |
Shareholder approval, minimum shares outstanding (in shares) |  | 277,778 |  |  |
Preferred stock dividends declared (in dollars per share) | $ / shares | $ 0 | $ 0 |  |  |
Common stock dividends declared (in dollars per share) | $ / shares | $ 0 | $ 0 |  |  |
Minimum public offering for conversion | $ |  | $ 50,000 |  |  |
Minimum public offering per share for conversion (in dollars per share) | $ / shares |  | $ 30.0996 |  |  |
Series 1 Preferred Stock |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |
Shares Authorized (in shares) |  | 245,096 |  |  |
Redeemable convertible preferred stock issued (in shares) |  | 245,096 |  |  |
Redeemable convertible preferred stock outstanding (in shares) |  | 245,096 |  |  |
Carrying Value | $ |  | $ 154 |  |  |
Liquidation Value | $ |  | $ 154 |  |  |
Preferred stock votes per share | vote |  | 0.352941 |  |  |
Dividend rate (in dollars per share) | $ / shares |  | $ 0.050112 |  |  |
Liquidation preference per share (in dollars per share) | $ / shares |  | $ 0.6264 |  |  |
Series 2 Preferred Stock |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |
Shares Authorized (in shares) |  | 709,617 |  |  |
Redeemable convertible preferred stock issued (in shares) |  | 709,608 |  |  |
Redeemable convertible preferred stock outstanding (in shares) |  | 709,608 |  |  |
Carrying Value | $ |  | $ 1,489 |  |  |
Liquidation Value | $ |  | $ 1,520 |  |  |
Preferred stock votes per share | vote |  | 0.352941 |  |  |
Dividend rate (in dollars per share) | $ / shares |  | $ 0.171360 |  |  |
Liquidation preference per share (in dollars per share) | $ / shares |  | $ 2.142 |  |  |
Series 3 Preferred Stock |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |
Shares Authorized (in shares) |  | 498,958 |  |  |
Redeemable convertible preferred stock issued (in shares) |  | 498,938 |  |  |
Redeemable convertible preferred stock outstanding (in shares) |  | 498,938 |  |  |
Carrying Value | $ |  | $ 2,862 |  |  |
Liquidation Value | $ |  | $ 2,874 |  |  |
Preferred stock votes per share | vote |  | 0.352941 |  |  |
Dividend rate (in dollars per share) | $ / shares |  | $ 0.4608 |  |  |
Liquidation preference per share (in dollars per share) | $ / shares |  | $ 5.76 |  |  |
Series 4 Preferred Stock |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |
Shares Authorized (in shares) |  | 2,509,047 |  |  |
Redeemable convertible preferred stock issued (in shares) |  | 2,509,032 |  |  |
Redeemable convertible preferred stock outstanding (in shares) |  | 2,509,032 |  |  |
Carrying Value | $ |  | $ 15,656 |  |  |
Liquidation Value | $ |  | $ 15,807 |  |  |
Preferred stock votes per share | vote |  | 1 |  |  |
Preferred stock, number of directors entitled to elect | director |  | 1 |  |  |
Dividend rate (in dollars per share) | $ / shares |  | $ 0.504 |  |  |
Liquidation preference per share (in dollars per share) | $ / shares |  | 6.30 |  |  |
Liquidation participation cap per share (in dollars per share) | $ / shares |  | $ 12.60 |  |  |
Series 5 Preferred Stock |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |
Shares Authorized (in shares) |  | 2,086,138 |  |  |
Redeemable convertible preferred stock issued (in shares) |  | 2,009,226 |  |  |
Redeemable convertible preferred stock outstanding (in shares) |  | 2,009,226 |  |  |
Carrying Value | $ |  | $ 18,127 |  |  |
Liquidation Value | $ |  | $ 18,275 |  |  |
Preferred stock votes per share | vote |  | 1 |  |  |
Preferred stock, number of directors entitled to elect | director |  | 1 |  |  |
Dividend rate (in dollars per share) | $ / shares |  | $ 0.72774 |  |  |
Liquidation preference per share (in dollars per share) | $ / shares |  | 9.0954 |  |  |
Liquidation participation cap per share (in dollars per share) | $ / shares |  | $ 18.1908 |  |  |
Series 6 Preferred Stock |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |
Shares Authorized (in shares) |  | 3,389,227 |  |  |
Redeemable convertible preferred stock issued (in shares) |  | 3,319,274 |  |  |
Redeemable convertible preferred stock outstanding (in shares) |  | 3,319,274 |  |  |
Carrying Value | $ |  | $ 54,508 |  |  |
Liquidation Value | $ |  | $ 54,674 |  |  |
Preferred stock votes per share | vote |  | 1 |  |  |
Preferred stock, number of directors entitled to elect | director |  | 1 |  |  |
Dividend rate (in dollars per share) | $ / shares |  | $ 1.317744 |  |  |
Liquidation preference per share (in dollars per share) | $ / shares |  | 16.4718 |  |  |
Liquidation participation cap per share (in dollars per share) | $ / shares |  | $ 32.9436 |  |  |
Conversion price (in dollars per share) | $ / shares |  |  | $ 15.5574 | $ 15.714 |
Conversion ratio (in shares) |  |  | 1.06 | 1.05 |
Series 7 Preferred Stock |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |
Shares Authorized (in shares) |  | 2,666,666 |  |  |
Redeemable convertible preferred stock issued (in shares) |  | 2,580,404 |  |  |
Redeemable convertible preferred stock outstanding (in shares) |  | 2,580,404 |  |  |
Carrying Value | $ |  | $ 25,752 |  |  |
Liquidation Value | $ |  | $ 25,890 |  |  |
Preferred stock votes per share | vote |  | 1 |  |  |
Preferred stock, number of directors entitled to elect | director |  | 1 |  |  |
Dividend rate (in dollars per share) | $ / shares |  | $ 0.802656 |  |  |
Liquidation preference per share (in dollars per share) | $ / shares |  | $ 10.0332 |  |  |

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- Definition Carrying amount, attributable to parent, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer. + References No definition available. + Details
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- Definition The aggregate liquidation preference (or restrictions) of stock classified as temporary equity that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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